document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=675790>Question 675790</A>: <I><SPAN STYLE=\"word-break: break-all;\"> A truck was able to average only 40 mph for the first 4 hours of a delivery route. How long must the driver travel at a speed of 55 mph to average 50 mph for the trip? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #420060 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=420060\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> A truck was able to average only 40 mph for the first 4 hours of a delivery route. How long must the driver travel at a speed of 55 mph to average 50 mph for the trip?<BR>\n" );
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document.write( "d = r*t<BR>\n" );
document.write( "r = d/t<BR>\n" );
document.write( "r = (40*4 + 55t)/(t+4) = 50 ..... (t = time at 55 mi/hr)<BR>\n" );
document.write( "55t + 160 = 50t + 200<BR>\n" );
document.write( "t = 8 hours at 55 mi/hr<BR>\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );